When We Examine Paraphilias, One of the Questions We Have

When we examine paraphilias, one of the questions we have to consider is "What is abnormal behavior?" Which of the following situations represents an instance where one has probably crossed the boundary into abnormal behavior?

A) The individual has no preference one way or another for his sexual partner to wear silk panties during sexual intercourse.
B) The individual has a mild preference for his sexual partner to wear silk panties during sexual intercourse.
C) The individual has a strong preference for his sexual partner to wear silk panties during sexual intercourse, but is able to have sexual intercourse even if she does not wear them.
D) The individual must have his sexual partner wear silk panties during sexual intercourse or he cannot have sexual intercourse at all.